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Deoxycholate-chitosan nanospheres fabricated by γ-irradiation and chemical modification: Nanoscale synthesis and controlled studies

机译:γ射线辐照和化学修饰制备脱氧胆酸盐-壳聚糖纳米球:纳米级合成与可控研究

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摘要

A systematic protocol to fabricate self-assembly deoxycholate-chitosan nanospheres (DC-CsNS) by γ-ray pre-irradiation and chemical modification was studied. Hydrophobic deoxycholic acid moieties were chemically conjugated to pre-irradiated chitosan. The influences of chitosan physical forms (i.e., colloid and flake) during irradiation, radiation doses, and the reaction system (heterogeneous or homogeneous) on the chemical modification and the particle shape and size were investigated. Pre-irradiation of chitosan in colloidal form produced smaller DC-CsNS particle size than that of flake form. In the heterogeneous reaction, the pre-irradiated dose influenced the DC-CsNS particle size, whereas in the homogeneous reaction all pre-irradiation doses gave an identical average size range of 30-50 nm. By pre-irradiation (10 kGy) of chitosan in colloidal form before heterogeneous chemical conjugation, it is possible to obtain DC-CsNS with an average size of 46 nm. DC-CsNS of about 50 nm in size could also be synthesized using homogeneous chemical conjugation onto non-irradiated chitosan with the addition of N-hydroxysuccinimide (NHS).
机译:研究了通过γ射线预辐射和化学修饰制备自组装脱氧胆酸盐-壳聚糖纳米球(DC-CsNS)的系统方案。将疏水性脱氧胆酸部分化学偶联至预辐照的壳聚糖上。研究了壳聚糖物理形态(即胶体和薄片)在辐射,辐射剂量和反应体系(非均相或均相)过程中对化学改性以及颗粒形状和尺寸的影响。胶体形式的壳聚糖的预辐照产生的DC-CsNS颗粒尺寸比薄片形式的要小。在非均相反应中,预辐照剂量会影响DC-CsNS粒径,而在均相反应中,所有预辐照剂量均会产生相同的30-50 nm的平均粒径范围。通过在异质化学缀合之前以胶体形式对壳聚糖进行预辐照(10 kGy),可以获得平均粒径为46 nm的DC-CsNS。还可通过在非辐照的壳聚糖上加入N-羟基琥珀酰亚胺(NHS)进行均相化学偶联来合成大小约为50 nm的DC-CsNS。

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